There's no disputing that the Earth's atmospheric concentration of carbon dioxide is greater now than it ever has been. This fact is alarming because of the Earth's greenhouse effect and how it warms the climate. So whether or not you believe that global temperature rise, retreating glaciers, shrinking ice sheets or extreme weather events are indicators of climate change, the scientific consensus is clear: human activities are very likely the cause of climate-warming trends over the past century.

But don't just take our word for it. Check out the science-based articles that we've assembled on research into various aspects of climate change. Then decide for yourself what actions we should be taking now.